ULN to SIA, Buyant-Ukhaa International Airport to Cheap Flights

Based on HopeGoo data, Jeju Air offers one-way fares as low as US$243 on Cheapest nonstop routes (e.g. UBN to XIY on Thu, Mar 19), while Air China offers Cheapest nonstop round-trips from US$459 departing on Mon, Mar 2 and returning on Mon, Mar 9.

At the moment, several airlines serve connecting flights from Ulaanbaatar to Xi'an, including: China United Airlines Air China Selected airlines are based on historical data collected from flight bookings made by users on HopeGoo within the last 90 days.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Ulaanbaatar to Xi'an is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from Ulaanbaatar to Xi'an, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Thu, Mar 19, with one-way flights priced at just US$243. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Jeju Air. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for Xi'an travel is around January. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Ulaanbaatar to Xi'an is September, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Ulaanbaatar to Xi'an on February 23, 2026 with Air China, with prices starting at US$258.

You can land at any one of the following hubs in Xi'an, with Chinggis Khaan International Airport to Xi'an Xianyang International Airport (UBN-XIY) is by far the most common option on this route: Xi'an Xianyang International Airport (XIY).

The time difference between Xi'an and Ulaanbaatar is 0h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your HopeGoo, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.